Lucid Train compared with OpenCode.
Not either-or. Lucid Train can run OpenCode as its engine.
This is an unusual comparison because they are not exclusive. OpenCode is an open-source, provider-agnostic terminal coding agent. Lucid Train is a harness that can spawn OpenCode as its engine, running `opencode serve` and talking to it over local HTTP with server-sent events. So the question is not which to use but whether you want OpenCode on its own or OpenCode inside a harness that adds a diagram canvas, a dependency audit and an approval gate.
How the pairing works
Select OpenCode in the engine picker and Lucid Train starts `opencode serve` as a local process and connects over HTTP with SSE for streaming. It uses the OpenCode auth you already configured; no credential passes through Lucid Train. It is the one engine here that is not stdio, which is a detail worth knowing if you are looking at a process list.
What the harness adds
Risk-tiered command approval, reviewable diffs before anything lands, the architecture diagram and its handoff into an implementation turn, and the dependency and MCP configuration audit. These sit between you and whatever the agent proposes rather than inside the agent, which is why they survive swapping the engine underneath.
What you keep by staying in the terminal
OpenCode alone is lighter, fully open source, and does not ask you to run a desktop application. If the terminal is where you want to be and you do not need a diagram canvas, adding a harness is overhead rather than benefit. Lucid Train's own CLI is also a terminal program if you want the middle ground.
The two limits of running it as an engine
Design mode cannot run on OpenCode, since that canvas accepts Claude Code and Codex only. Connecting a new Grafana instance requires the bundled Lucid engine, though querying an already-connected one works on any engine. Both are worth knowing before choosing OpenCode as your default engine.
Side by side
| Lucid Train | OpenCode | |
|---|---|---|
| Can run the other | Yes, as an engine | No |
| Form | Desktop app and CLI | Terminal agent |
| Open source | The CLI is | Yes |
| Provider-agnostic | Yes | Yes |
| Architecture diagrams | Yes | No |
| Approval tiers and diff review | Yes | Its own |
| Drives Design mode | Claude Code and Codex only | Not applicable |
| Price | CLI free and open source; desktop $3/month, 7-day trial, no card | Open source |
Questions
Related
- Lucid Train vs the Codex CLILucid Train drives the Codex CLI rather than competing with it.
- Lucid Train vs Gemini CLIStated up front: Gemini CLI is not a supported engine. Gemini models are reachable another way.
- Lucid Train vs OpenHandsA platform with many surfaces, against a harness built around one idea.
- Lucid Train vs draw.ioOne generates the diagram from your code and solves the layout. The other is a blank canvas and a shape library.
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